Seagate Barracuda 7200.10 750GB (ST3750640AS)

Here is this fish weighing as much as 750GB. It is codenamed Galaxy 4D where the number 4 stands for the number of platters. Easy to calculate, the data density is an astonishing 187.5GB per platter here!

Seagate Barracuda 7200.10 500GB (ST3500630AS)

Descending further along the Barracuda 7200.10 series, we meet the 500GB model codenamed Galaxy 3D. It has three platters, each with a data density of 166GB.